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import scala.reflect.macros.blackbox.Context
import language.experimental.macros
object Interpolation {
implicit class TestInterpolation(c: StringContext) {
object t {
def unapply[T](x: T): Any = macro Macros.unapplyImpl[T]
}
}
}
object Macros {
def unapplyImpl[T: c.WeakTypeTag](c: Context)(x: c.Tree) = {
import c.universe._
if (!(c.weakTypeOf[Int] =:= c.weakTypeOf[T])) c.abort(c.enclosingPosition, s"${c.weakTypeOf[T]} is not supported")
else {
q"""
new {
def isEmpty = false
def get = 2
def unapply(x: Int) = this
}.unapply($x)
"""
}
}
}
|
